My ex girlfriend used to do it to me a lot, I used to get text's from a couple of m8's that would start with 2Hi Hun" or sommit like that, she went mad, giving it the old "why's she calling you hun etc, etc." I put up for it for a while, then it got to the stage when she'd look at my phone when i left the room or something. Copped the big elbow straight after that.
2 valuable lesson's to be learnt from this
1) Delete all your messages
2) If you're gonna abuse someone's privacy, don't feel you have the right to kick off about it